The film was directed by (using the pseudonym "Simon Sheen"). His history is arguably more dramatic than any ninja movie:
If you ever noticed the kids look younger in Knuckle Up than in the previous sequel ( 3 Ninjas Kick Back ), you aren't imagining things: 3 Ninjas: Knuckle Up
: Shin eventually moved to the U.S., where he directed this third installment of the 3 Ninjas franchise. Why the Timeline Feels "Off" The film was directed by (using the pseudonym "Simon Sheen")
: They finally escaped to a U.S. embassy during a trip to Vienna in 1986. 3 Ninjas: Knuckle Up